A Set of Monitoring Tools for Path Computation Element (PCE)-Based Architecture
RFC 5886

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Internet Engineering Task Force (IETF)                  JP. Vasseur, Ed.
Request for Comments: 5886                           Cisco Systems, Inc.
Category: Standards Track                                    JL. Le Roux
ISSN: 2070-1721                                           France Telecom
                                                              Y. Ikejiri
                                          NTT Communications Corporation
                                                               June 2010

                     A Set of Monitoring Tools for
           Path Computation Element (PCE)-Based Architecture

Abstract

   A Path Computation Element (PCE)-based architecture has been
   specified for the computation of Traffic Engineering (TE) Label
   Switched Paths (LSPs) in Multiprotocol Label Switching (MPLS) and
   Generalized MPLS (GMPLS) networks in the context of single or
   multiple domains (where a domain refers to a collection of network
   elements within a common sphere of address management or path
   computational responsibility such as Interior Gateway Protocol (IGP)
   areas and Autonomous Systems).  Path Computation Clients (PCCs) send
   computation requests to PCEs, and these may forward the requests to
   and cooperate with other PCEs forming a "path computation chain".

   In PCE-based environments, it is thus critical to monitor the state
   of the path computation chain for troubleshooting and performance
   monitoring purposes: liveness of each element (PCE) involved in the
   PCE chain and detection of potential resource contention states and
   statistics in terms of path computation times are examples of such
   metrics of interest.  This document specifies procedures and
   extensions to the Path Computation Element Protocol (PCEP) in order
   to gather such information.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc5886.

Vasseur, et al.              Standards Track                    [Page 1]
RFC 5886       Monitoring Tools for PCE-Based Architecture     June 2010

Copyright Notice

   Copyright (c) 2010 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Vasseur, et al.              Standards Track                    [Page 2]
RFC 5886       Monitoring Tools for PCE-Based Architecture     June 2010

Table of Contents

   1. Introduction ....................................................4
      1.1. Requirements Language ......................................5
   2. Terminology .....................................................5
   3. Path Computation Monitoring Messages ............................6
      3.1. Path Computation Monitoring Request (PCMonReq) Message .....6
      3.2. Path Monitoring Reply (PCMonRep) Message ...................9
   4. Path Computation Monitoring Objects ............................11
      4.1. MONITORING Object .........................................11
      4.2. PCC-ID-REQ Object .........................................13
      4.3. PCE-ID Object .............................................14
      4.4. PROC-TIME Object ..........................................15
      4.5. OVERLOAD Object ...........................................17
   5. Policy .........................................................18
   6. Elements of Procedure ..........................................18
   7. Manageability Considerations ...................................20
      7.1. Control of Function and Policy ............................20
      7.2. Information and Data Models ...............................20
      7.3. Liveness Detection and Monitoring .........................20
      7.4. Verify Correct Operations .................................20
      7.5. Requirements on Other Protocols ...........................21
      7.6. Impact on Network Operations ..............................21